loadJpeg()

FramePtr fl::FileSystem::loadJpeg	(	const char *	path,
		const JpegConfig &	config = JpegConfig(),
		fl::string *	error_message = nullptr )

Definition at line 103 of file file_system_codecs.cpp.hpp.

                                                        {
    fl::ifstream file = openRead(path);
    if (!file.is_open()) {
        if (error_message) { *error_message = "Failed to open file: "; error_message->append(path); }
        FL_WARN("Failed to open JPEG file: " << path); return FramePtr();
    }
    fl::size fileSize = file.size();
    if (fileSize == 0) {
        if (error_message) { *error_message = "File is empty: "; error_message->append(path); }
        file.close(); return FramePtr();
    }
    fl::vector<u8> buffer;
    buffer.reserve(fileSize); buffer.resize(fileSize);
    fl::size bytesRead = 0;
    while (bytesRead < fileSize && file.available()) {
        fl::size chunkSize = min<fl::size>(4096, fileSize - bytesRead);
        fl::size n = file.read(buffer.data() + bytesRead, chunkSize);
        if (n == 0) break;
        bytesRead += n;
    }
    file.close();
    if (bytesRead != fileSize) {
        if (error_message) {
            *error_message = "Failed to read complete file. Expected ";
            error_message->append(static_cast<u32>(fileSize));
            error_message->append(" bytes, got ");
            error_message->append(static_cast<u32>(bytesRead));
        }
        FL_WARN("Failed to read complete JPEG file: " << path); return FramePtr();
    }
    fl::span<const u8> jpegData(buffer.data(), buffer.size());
    FramePtr frame = Jpeg::decode(config, jpegData, error_message);
    if (!frame && error_message && error_message->empty()) {
        *error_message = "Failed to decode JPEG from file: "; error_message->append(path);
    }
    return frame;
}

References fl::string::append(), fl::ifstream::available(), fl::ifstream::close(), fl::vector< T >::data(), fl::Jpeg::decode(), fl::basic_string::empty(), FL_WARN, fl::ifstream::is_open(), fl::min(), openRead(), fl::ifstream::read(), fl::vector< T >::reserve(), fl::vector< T >::resize(), fl::ifstream::size(), and fl::vector_basic::size().

Referenced by fl::loadJpegFromSD().

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